Abstract
For many years, HHG were generated in a variety of gases, including atomic, molecular and ionized gases. The resulting harmonic spectrum has some universal features, common to almost all gas species in use: it has a long plateau region in which the intensities of all the harmonics are almost identical, followed by a sharp drop, called the cutoff energy. The universality of the harmonics spectrum and the lack of small details related to specific gas in use, suggests that the HHG process is a non-resonant one. Recently, it was discovered that HHG in some laser-ablated plasmas do show resonance features in the harmonic spectrum. This resonance coincides with a transition from an autoionization state, back to the ground state of a singly ionized atom.
© 2017 IEEE
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